LTS tests (1.6 to 1.10) (#254)

* LTS tests (1.6 to 1.10)

* update cross checks

* readme checkmark

.github/workflows/TestLTS.yml

@@ -1,4 +1,4 @@
-name: Test v1.6 (LTS)
+name: Test v1.10 (LTS)
 
 on:
   workflow_dispatch:
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: ['1.6']
+        julia-version: ['lts']
         julia-arch: [x64]
         os: [ubuntu-latest, windows-latest]
         experimental: [false]

README.md

@@ -38,7 +38,7 @@ If you want to migrate your project from [*FMI.jl*](https://github.com/ThummeTo/
 
 - [ ] New low-level interfaces are introduced, that fit the SciML-ecosystem. For example, a FMU can still be simulated with `simulate(fmu)`, but one can also decide to create a `prob = FMUProblem(fmu)` (like an `ODEProblem`) and use `solve(prob)` to obtain a solution. Keywords will be adapted to have a fully consistent interface with the remaining SciML-ecosystem.
 
-- [ ] Optimization for new Julia LTS v1.10, removing code to keep downward compatibility with old LTS v1.6.
+- [x] Optimization for new Julia LTS v1.10, removing code to keep downward compatibility with old LTS v1.6.
 
 🎉 After all listed features are implemented, v1.0.0 will be released! 🎉